Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801fa9dcba9b7aafd53523d53c071185e7d3b029fe8dde6ce8a3a4621aa9cd21' 
  AND token = 'YKSEgpUjs8LeWH5y+q0towy57G7nBrBQVPSNSP7ur7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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