Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e891dc7ef19a4ce1bf924f717b8a81c0c9d8baab68d6c82253a0c8915ee59297' 
  AND token = 'pfzeHpagfo+1hYg27gBqtmrjwpUoGF8S8qGta1O6ioE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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