Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8e098918d3fc786f4ddb6ee20bdaafaceee02b1f4e3b0530c20d04ceae5d81' 
  AND token = 'yZM1gzIbl+J2o5y3dL6XtbIG5AXWd9s/aEBUR9ANsF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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