Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf876c0ec71fbf4a36332547d415d94cd9eb56dd797b89dffe04771ea0cbb5de' 
  AND token = 'ASs7JVgO+9Ht1GHyzYOKRB1eQxrtzTQTMGiEPWzcb24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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