Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503f75a220e14cb39fa9a65670063bf8fb0bce088cc19174dc4e0cd7aaa0ff5b' 
  AND token = 'Yiua+QI4E4NgIrC2g8vFT1M/8xDtOA2a8hCJPfg7Wk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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