Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2eddc917ce6fdf9f5b94108b47924b1cd7c3fcd5f1e635e55849a9ffe5dec8c' 
  AND token = 'nGWIELhxVhQNmMiRhD4N09PZ+xnbfxve4gwDrxoxf3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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