Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a36ec9d2a72fac653c40e71beff155acf4725c5e1444674663f087a5f1c66f' 
  AND token = '280OfRooOv419umNKwqzDnpr7fXIbV51avTlGBXBtPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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