Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21e82cfd3e53e7d04ef4bc9d0b03b18b1df738635a8e482c00a4e2318a112c80' 
  AND token = 'ePN1bOT1xmqpJMyc96ULfvtPCrZdQhhOYKf24aBFwNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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