Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d28005f74129396259433105728eb1faac9ad54ab69af3eb9dff1744beb2863' 
  AND token = '3LvLKbTcK1hdERZNddAgjBV6i+osNFsHnbx5vrF50Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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