Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a398381e2c95f23b434cef675ec20940c9558ad9ee8488197cb419a5702c792c' 
  AND token = 'Vhf/49aO9Etnnb96flEIMHt2DOtSQz9EEe+E0lhrmfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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