Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3185a032ac75f7353c3eaa4bbe6e8c8ac30ee888f93f9ce15062f3bf7ffe764' 
  AND token = 'eAfjbkMch3msDUhKwQXWstadeva0SXQ12oIB3wdJhlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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