Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cc8f9c1398a7a81d07690d846d93f5f6d42c5538670cd43a5bd29f5d7a7a7c' 
  AND token = '2mfFRrx/WlnwSMkBqiWSnmNxP26kh0VxeHwpbi90R7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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