Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af8a211d9d9a3ffe26e820cc3d35550a55e57a5e65cb6eefab958d1ae1d568c0' 
  AND token = 'Q5XyLjyOwzPHAp0Rma7PKNMPzJXWfYyz8C45PwN0exk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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