Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b00f29a774d37fed71ebde4a4e7e76f0eebf1672edd13027b75f318dcb5761' 
  AND token = '4a/xql9NdRdKoLa5Xb+y4rr3BZ0ul+uWalBVn8KBOA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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