You're free to use this song and monetise your video, but you must include the following in your video description:
Martian Cowboy by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100349
Artist: http://incompetech.com/