Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee0c35afb675b7c0dccaa17419bec9fb9a00bd3d7a6d6329abb4164b7b9a9f9' 
  AND token = 'A3+WDUUYYHxYjyQsAmD8wwJdcsRExNTHHCtz3OCza64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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