Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31b885b42b59e5d85e3d1d3ed55ff6f12d9d231c98dfe8c45bbad0156f2467f' 
  AND token = 'O7nLJLSCr3Icdsu6ekp+bDHsvfxCzSDpL0pIuqsocJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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