Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102b8247009bf84b2c5de6d85afcfbd5be2540d34c3e5c3ac94a211c7b3affe9' 
  AND token = '7BiGULZBBvLRiuiPkXl9H38z05GQZuEbcmuLD69pl/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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