Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c7da3359955bfa20975562414f38c2b73eb2e2d32fc63a099b81b7e65fde50' 
  AND token = 'jmbBdfLQBMnt0y9z0MFj+Kx6EPPBlpkB/DwX92rVfaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}