Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68e28854f9d7224f31ba7359e22a2e0dd316e713d9bf256cb9d08e7eba063ea' 
  AND token = 'dtUd81HWhLkbn7g4AgWHqlEOLisDxJPGyenXEh04C1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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