Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236c4f7c81069478711561744813a0af8b385e8fc3d32e180375846d1f87bf30' 
  AND token = '4QOUZC+1lBE3F/4Jf+9SluFI4jZ8XN3zTSaj8/xemes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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