First, check your spam or junk folder. Order confirmation emails sometimes end up there depending on your email provider.
If you still cannot find it, make sure the email address you entered at checkout was correct. A small typo can cause the email to go to the wrong address.
If you have a Keydra account, you can always view your order details directly from your dashboard. Otherwise, contact our support team with your order details and we will resend everything you need.