Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6341f316a3777f0ec2c8f1cd6cd20016aa709617329fcd3562fca8e76b0c974' 
  AND token = 'a3XKFCggCfAeCnslZWwn3b+4JJ+gJ+iRkMXZRViWMfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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