Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6312ce4d0a4a343a49d8ad232835966eca934aca72ba6d1c9d87e9fe28a7fb46' 
  AND token = 'dq61i3WPuRK0RybbQUI8KfmDgbzIvJ1MtAwETWj6mlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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