Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e394b900fa91a2771ff8fafc46da6a06b5b131591fcda2cebd05ebded4638794' 
  AND token = 'XIoynQs/jOXusYUhaYKZ89a6oU6csNNfoRKF/Hisy7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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