Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38da1e936e774e5207de08ac23957b94367c0b20362361ca8a363d0749fbc4fc' 
  AND token = 'Ccg/hVblkru+Msk4ugMzgTXP5KOgA1jmPzxTr//8b+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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