Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b4e9206f48d27984a11ec6efd684868fd0a1c88e78551ccfaf7a3cb07f07be' 
  AND token = 'cl5Zu8PoAGPZnTAT/GUHBm/wbTtavN9B6LRX6u2L8X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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