Just an extra advice.
First of all, don't attempt to use hairdryer to dry the keys, they might just melt, depending on the heat! Just wipe them until they're dry.
Also , I suggest you do this soon cause If you let your keyboard with the coffee there for a long time, the keys will get sticky after that and some of them you will press them and they will remain pressed.
In my case, what I did was to remove each key carefully, wash them or clean them with glass cleaning fluid, cleaned the board below the keys with a wet cloth until all coffee was gone... including the holes where the keys stick in, some of them contained whole sips of coffee
Most keyboards have tough keys, they don't break if you pluck them out.
Oh, and something more about water. Even if you ever wanted to open the whole keyboard and wash it, it's not a bad idea...even the circuit board
Believe it or not, I have washed (literally, under the tap ) motherboards, access points, network switch boards etc... most of the times, this solved problems of spilled liquids, rust and salt spots.
They key is to dry them all well and use a spark contact fluid to spray them with afterwards.