Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d9a5b9a8a573638cf6fcef10d3d8ace94b6cb20ce91a5c3ca7b5cdb02881b0' 
  AND token = 'zXdolpVuCyIhgi7hqatmia8NopsT4yb/81eBN6lMyPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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