Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36194c945746f48129efb3a2fffa28d9b9489fb872d273baa87eeee4b332041' 
  AND token = 'NxNhlGt9ShNO6DMscNgwR2m5Id7sa4NmkodltFxG8fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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