Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63fabaddb36b5bbfbe50622db843058d8acb35e6be6b8e098f3bc862ee4cbe1' 
  AND token = 'CR1uWldkZDbHla1byZ91Y5bRqOlrEJUfkPqSpper8MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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