Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c96c67acee253be713acb6e1e16262188444c2830d3f6fe9aa048ca80a94b0ff' 
  AND token = 'haQpE7PFGTx+46ExqJ+LsUW/3vkKo1vHMpyuFGPuLxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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