Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1504010c467bd1a83dc835201dc7722a40bab133eee127e786cef3c94240fa8' 
  AND token = 't+qv7uWiFybIvDqCn+DlBVz9ODrs82zYRBslOXoExZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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