Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad349dd3e8f7f573f16bd80082cc7b3b4d3e580f347d8047335ac9bf5dc89657' 
  AND token = 'rER09LA1GgOA/VS43rJ2Crvd9HNnGBDUIH90JksF5Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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