Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9eda7100ed56f763c65b94dccd86c0c0ade8a01d1df50cfa12f53d1dba565534' 
  AND token = 'PI9kqDJEJIbwzpZ4YLU5sC9AmGA0jvKcpTPkF1I0Rhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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