Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7122a6908f32240652aec9019e2ae64119a0dbbf82b50efc51b9f836b9acde' 
  AND token = 'Lk78O5ZOEmfECLdE2/CEjpQI6sCeIiByAWDTZzHHMS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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