Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efed12530df5be66929558a24f718388c3b615bfd01fdd75d17f7f0a354823d' 
  AND token = '2tJyqj5L79RLs5pxAVU/9UZari1FfAj8IB5tmUq+Hpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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