Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1e0c92451ec0a2accc33c28d2c0a66379b00b56b70f0ba46996ef14242db4c21' 
  AND token = '5YEagnIOr7O0R9gTyd0SiQSLEEzEGSEuT+jT1SInzm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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