Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd160fd0c240960051adb05c14321d81dbc7d907bd6ad5fd3f8d53fadf65a1e71' 
  AND token = 'q/GQbbuJGnGAfFkUbwZBOJoVtoT1pH02/yxrVsTczpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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