Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce5b0e26ec0a62444541c76343978d5f9e613a5dc02eddeb33fda0d18ef98fbe' 
  AND token = 'GYU1w8k94TlH1xdqRnHG+4qcN1ja2WLQtA8hz0jVBIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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