Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918df48ea136370e0c409ca0cd720691a328ed9e6c5d85618bf2b105dc89d895' 
  AND token = '4mx5sGz0HnHtZ6y+pW+k7bRXzEX/+yb6LJpYSdOCoDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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