Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1120c094853066d80c34dfd78d9c4be4b932cb1aa784c0f4b2b934c29914f10e' 
  AND token = '5gKP4ee8D1FFQmqO/i3WB8Slej1yp1ZkRJJ0DbdiWh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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