Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5d5b1fd8509d3e95c3cef606986b2a4db7f4ca2f9a764454669105b7143f8d' 
  AND token = 'WDEvkyyCwnVmeY1mYts1x/3z0fhfL0sT6PTTGgwkgLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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