Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fb38bac64e2ed7edbd5a8d370a0e72e5757c69086ba97facf7d3fb2452d76e' 
  AND token = 'ZalS5tyE+3AjPUsH1nyQIX6mb3QqKKbcl8VQoBAIoMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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