Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99875efb7c1f6e8eef629e822ceb4cfec3f4aed39fa0f6b5005319e70691c6d8' 
  AND token = '7GyVe5apTiDsSNsqFrpB/TF0W1xbtp4coGDwt7L/oBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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