Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9ddc288c9c1056ed31c49a076c8afdcf249ed422f7f8cba30d0a908732a313' 
  AND token = 'eCE1P0cvy6gm3qmXNfdztvmVB8qsNE52VDCU85Ug9Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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