Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c6fcc83662714b73ac8c76e893b414db6688c36f34893eae971516e057cc166' 
  AND token = 'gECJWiMrxwRaq4JiGhJVBEB8nHIZMR1ye6NFojvcgJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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