Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674bd9ac1f8dc12a28f2292ca640db34f7d317bbf81e041f3aacc7ff33f9fbab' 
  AND token = 'MGEs5PY0Zp/317a+Ik9EoHB3u8RENf4ERQu8V2JKnvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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