Outboud connection to external mysql server times out

I'm attempting to connect to an external mysql host (11.22.33.44), but the connection continues to time out. The server I'm connecting from (55.66.77.88) is up and has internet connectivity.

Server 55.66.77.88 iptables config is presently:

# iptables -L -v
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination   

I've tried using telnet 11.22.33.44 3306 but this also times out.

Server 11.22.33.44's firewalld config:

# firewall-cmd --list-all --zone=drop
drop (active)
  target: DROP
  icmp-block-inversion: no
  interfaces: eth0
  sources: 55.66.77.88/32
  services: http https mountd nfs ntp rpc-bind smtp ssh
  ports: 3306/tcp
  protocols: 
  masquerade: no
  forward-ports: 
  source-ports: 
  icmp-blocks: 
  rich rules: 
    rule family="ipv4" source address="55.66.77.88" service name="mysql" accept

What am I overlooking? I am able to establish a telnet connection to 11.22.33.44 from my laptop.