Ah, OK. I think you should create a ~/.ssh/config file with a config section, specifying the key. However, I don't know if mc can properly ask for a key passphrase, so it might sense to have an ssh-agent running, too.
The section in the file would look like:
Host kindle
Hostname 192.168.1.4
IdentityFile ~/key.key
User root
and you can connect using "kindle" as the host to connect to.
See ssh_config(5), ssh-agent(1).
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