Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87542be33a67cecf7cdafe3256f6d97745f833f53a9df6cf6da22a85d582b3b3' 
  AND token = 'P+TRsuJfbWoq0BrpvOOLgzJ8NUQgp3EdV44kHmkIE8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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