Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6778de5bf99a6779cc54bfbf57956f17f42667197ac38a5152422a170637666' 
  AND token = '9x2xhiQQ+xuISK4kpZXpQQ1juAOxFldEYSsNIkz/UQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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