Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34453a482a9e9780b614d011602b127a55d9a8d2f28a78a135381b8b9f00e6e2' 
  AND token = 'S7Qxg0Ib1oY7Aqbvy1K7cxB5h/e5ZPDL3teZqt3HTnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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