Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99df36a3debfcc8216cfca086eb0376b78f0b75d22d2e1098879173be16165a6' 
  AND token = 'cx4bOeldi3KycVTABKaUKJmv3nmX4hctF3FhK9h/D/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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