Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79804fd302c78c2365b9a42cb437b087f7f108c88dcd27d4d7e41f9791ad4dbc' 
  AND token = 'cD1FtC+tcE3mlwv9PE4aWxO6xRcfFzfHVCB6XdyIfok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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