Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef7a728c1e7e12561440e3fe20c64b6804cbcfe4657d86020d53f2a112cbf1e' 
  AND token = 'RM6OrHaBjcmt3WXhxVZfkYD/7lKDTGnX0e9mJMxpZdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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