Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90a84aa8011003d7a506e1c6bd52f01514ca777429fb24d1f4c05e67ecded9c' 
  AND token = 'kO9MsQHWn/30P0Xf2jO+84i27KL+a72bY3VGlZNibN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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