Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424ad0c90c5a5ff34f9d616f961ba3b60780595573b00c795920d59a4af43878' 
  AND token = '2Lw63StZhMyZbN1KLArC+rtjDodmTPFOvA9WcvDTUyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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