Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21c4ebac2d25a386867cbed97f2edcbae7c4bea473bc386417cb577eeb3c19c1' 
  AND token = 'cmbn+ua/QCHRz38qZB0pHNITwwiDwgLh8QDwYybGRnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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