Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c40f0dc39ef9ce84d0af7d03904effb579e90fa554076a3f7b45235ed6e1f84d' 
  AND token = '4Jw7YPGF+xxdMvBlND+8VUKDD7mo5xKXf0LZowplEoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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