Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be257c7dd414715f7c38a5d88dfd7ec5826b025a3b3d3bde4fcfc8b3003540c' 
  AND token = 'adwg0v9Ktg0UF2eWPsMcWYnEOZgg56B5VRRwg9I1HHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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