Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc66dc6609521760d4836b17f7c69c66628689bb20913dcd58f63f04aecfc712' 
  AND token = 'AV9FifwE8OPlOUj4xRs3G8UX/8ezm7fCXHbHxuLRCaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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