Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ceebae3ee29d893e9f394b17b39924d7d0c6c00a4ab38704cbb0a46ffaa791' 
  AND token = 'lh4TXnt+aVg4iOhvxvKZM7nkcoOa0fuLAWA5FVTv0eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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