I think it depends a lot on your circumstances and the reasons for your move, and on how you sell it in your cover letter/interview. There can be entirely legit reasons: moved to the US and had to wait for a green card, long sickness, etc. In that case, it shouldn't influence their decision to invite you. Depending on the reason, it could even be a positive factor.
Of course, being invited by McKinsey depends on a lot of other factors as well. If you want to be on the safe side, I'd recommend networking to get informal feedback from the office you'd like to apply to. This might even get you a referral. Good luck!