Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e542adc8d18bfb90398536330217daeef9b9f537450e3a25ad93d33ce4972f72' 
  AND token = 'iBafv3cADRpA433vApY0ysuKavFuqfokgLy0GbGXhKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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