SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6f01e2af7a8110650a29e6ad5dcecd53caf7aa384fa3eadfc13226eb4cb962a8' 
  AND token = 'rMT6XLl1NyjVqbIXNumf+KvWj+K4yHnJGS7GnPxYWqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00151

JSON explain

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