Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16dc63cd99ef38d990652b5bc6eac240d0a29fcc3b748fb5ae519f9bcb8eadd5' 
  AND token = 'YHYrSokzBMQ/ub89SVcs8Web23Awh6xGo2oohbNZSWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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