As far as I know, you can call the dealer with your vehicles VIN number and pick up a spare with proof of ID and ownership. You'll still have to pay for the replacement key though.
If this is a new car, you should get two. Please call and talk to your salesperson and they would arrange for you to pick the other one up.
I would call and see if they happen to have the spare, especially if you bought it brand new (no previous owners). If not, you will need to return to the dealer or call a lock Smith to get a new key. But I would push where you got it from because newer keys especially if it has a fob, can easily run you $350-$400 to start
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