Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de81571f9319a63626df6488d7124889b3b175610e96b0dc2991c6ed7560be8' 
  AND token = '58CFvB9wOGUd13Hp9hjSFjWXut1eka17NmdzWrTxGxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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