Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d450362017d2b459caa35c10d4ac8b355fa443597af6ab8959225063032836e' 
  AND token = '31skCN0gFzfcr8B2nHBQKzUWdNSqlXXlPr0JRbClO/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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