Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d9a39d56868345a063e967873f429cf3d8638330bfbeac11a71483dabfd453' 
  AND token = '4gUEUbKbqocAD0YKCKuDUlDcf8lW92xuMGYH4bqHX24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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