Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '321aa87056873da1675e4ee19269c569965b258fe86199875f02039d283f073e' 
  AND token = 'Nqg0sZsNTMSOD2mh+gdtga5TOPPnXV+KUVKvlEcK9n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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