Coffee unaffected logic board sticky non-funtional keyboard

There is two ways you can attack this the quick easy way, but expensive or the hard way which would be cheaper and may not fix things.

The easy way is to just replace the MacBook Air 11" (Mid 2011) Upper Case with Keyboard following this IFIXIT guide: MacBook Air 11" Mid 2011 Upper Case Replacement

Or the hard way is to follow the same guide as above but take the keyboard apart to manually clean things with distilled water and a good grade of isopropyl alcohol (85% or better) to help dry things afterwards. Here's a Vid on the process: Replace liquid damaged keyboard of 2011 Apple Macbook Air. Even after cleaning you may find things are to far gone to recover the keyboard.