Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c1959ac3d36415114d407d9e857f6a020e9035a7f1758d6ce51b88f5028dac' 
  AND token = 'ulS7kQ4WdztmQmrhMqaZg/HS8TrP3plV5Ow1s1jFDAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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