Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61445cad308c06b33ce18453b975debb59382f4b2878b966d0cfaecee526536' 
  AND token = 'Jb6uMHQkemzX5Ol+9tWgh3DYzurcyclmAsQGdaEuoGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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