Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6122b6f9b780879afaa75bd403e3cb81f247e3d518c799f40579f9c292d0cb' 
  AND token = 'mMZTlnIzwkUvPq+J6y6YUcoW2OkzRBIm7k5pYHWad7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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