Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '353b52a630fd773a38419975e9e7d97875add0129fbf10e09ead812c88d958b9' 
  AND token = 'Jg4NDJt+X30VWKWjXY9YHnAudaN8FGQR5zx56EWW65I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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