Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330716fc75dcc13030de61c97df7dac539c27d739ec040e1609ba12ddef61b6d' 
  AND token = 'mzCSSNcfbrf6z4kz1mlVoI6uhejCwxnyi/hQMYuUIhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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