Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e83ce595cd1f627dccc2c1e6d73288126653f7441b7b8bdcec86d23cc81cfe3' 
  AND token = 'hvAHpmTfYnkd1GfLZ1URxXzuEi0RIXHkhdpBtj9Vpe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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