SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '05c818e80b9be6d768e3ad6087b80747744f3c8cb3c2466d346f61d104156179' 
  AND token = 'w9y/iopQPtNOLfVwj7txHmUAJ5GWhZJgZnNf+82lid0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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