Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d266c42a6da8f3b56c8f45108db8193b8926fc21badb83b15e5d929cbaf3b6' 
  AND token = 'SsDwFjjVqsv2dsbasT9mzekyv7TjxVibOReGUGjHlnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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