Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f5675b4246f47f417470643257ba29735715b26fd97432934cd80066c8af88' 
  AND token = '36G8qjvsJ36ieZR617OzAEmOekQjrJYMEyo41xwT2Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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