Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8444130dbb33a97dbc1fe370cbf452e25c18a5d3b990b6d8e68622b351bfff' 
  AND token = '35rQJ3pZ/PNMkGo8yAwBhyXmszGZ370mrNKJDgB3oa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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