It helps you to find and copy SSH public key by just type a few letters and enter.
It even creates shell script to help you generate ~/.ssh/authorized_keys file. Just hold Command(⌘) + Enter to select your key file, it would be copied to your clipboard.
Work with Alfred 2.8.1. The newest version so far. Hope you'll enjoy it.
There is a blog post(written in Chinese) about this workflow here:
Feel free to contact me by comment(Both English and Chinese are welcome) on my blog.