Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe428391d1a3b9947d8948ee599bdc659ddad99deb08563f2a6c3992b0d312b7' 
  AND token = 'N0MHFnH/6fLHddZS2aWj/0fH2dNXnY23dTIZ+cyZoqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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