Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb99c1e3f0728f655158a676bfaa35ae1bd13571bc6c491750a3d1b2ac66e723' 
  AND token = 'lJugwaCFsKU9HAteuydXc5t94DnBZT0WzZm6v84/OnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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