Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f0bc6b6906986c8ee9078c57e17fa0d6f2a18c6a7e62cd7b9b50f37d029738' 
  AND token = 'gUtmqV9dYL8IeWeR34o+vpmsxnxhykJhkMPxURaapls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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