It takes place in the future, but that's just a time frame. Of the fact that it's in the future you will only see TWO visual hints. I won't name 'em.
This is a western that harks to old Eastwood 'Fistful of dollars' style but done 21st centurywise. The Directing and camera work is done spare and elegant. You start off thinking it's being done cheap-- but it isn't. The creators have an innate feel and understanding of what the adult 'Western' sought to illuminate.
The focus are the Men and their Pasts, All strangers meeting in the desert. And the Desert as a crucible from which the Truth and Survival is forged.
There are no spoilers here, that would be an insult to the film's creators. . .So have a brew or a glass ready nearby and Watch the movie. And just try to figure out who is Who. The ending WILL surprise you.