Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c9c35d99430ac317031ac41a87c9be3f8a3db224993ffe5cd1adaecc6adef6' 
  AND token = '8O7QjnL247F9T6q5xzj6baBvsuBCaL1Z8YOopubchPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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