Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a39f2d4f2f965dfc9eee603f897fdf92e1bf1051a4b53cfb0f099af8437ef5a' 
  AND token = 'hHns0kr+DCUUg/iMa/PG112QkXLzeuN9Y0jM8nXDhQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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