Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ade1f4cd440562bdfc3e30e44af2401b150d48ae216de8322fc284ec3d58b5b' 
  AND token = 'K4cZCIzu6oNGcqdOM8ltpLBXwtn6yiE0VM5PGVdWlzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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