Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1731dd23445017f0654377a9fca318f0e8680482f02f8d6117fb7f9539f9ac46' 
  AND token = 'iADJIkUUvuszBLRoqE5T6fRIgUiWCQJNktYdF7znlT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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