Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0ea2991cd2ecfbb2163c51b2e283aa9d3a16370f87430cb29f879e2f7080d6a5' 
  AND token = 'OfY1mruabJuylZOWal9A1XwM/Xyi8AK+W3cgEg2qCx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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