Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e91b2f3cd3684b53e862c1d33e20239d79c7368a6b1135c973cb3045a69fab' 
  AND token = 'KFLZqnW4J9cUGvNIH+FHAcA/SWWraPEqtodMVSyTU7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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