Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '64a667fd36ce1ecd75b381d2b7f0d00671fdd75390841592ba2e1f3af00f7f8b' 
  AND token = 'Ynh1/W25Vyg+h8nTfInH0DW87pPGvE14W2XHfoEJxgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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