Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2c63d515e33af6f1643a4a85a1ce3b09a6e16e45f0e9bba19e8c21ab1c9831e3' 
  AND token = 'jNmOvYC9ZX1LfIAFigGmQY4kZ8WyEA3rYSWAjnFmSCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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