Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de99d7639c482fa929a9d484895ced3db37800fecbaadb04b7e38e16e2ecf54' 
  AND token = 'RsWtJIXk96b4ZkCx5yn/Adq0tKbLNs13yCxr65+E24c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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