It’s good practice to password protect any encryption keys but it’s not always practicle to do so. So in doing this it degrades security for convenience.
Create a copy to backup the key in case something goes wrong:
cp my.key my.key.bak
Remove the pass phase:
sudo openssl rsa -in my.key -out new.key
It will prompt for the passphrase to produce a new version of the key without a passphrase.