Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a521b8fd4b547f1b1c14c63f4ee8789193003d3c86cd72648c0ebe0f91f968dd' 
  AND token = '1fDkGuJgyUtU0ofD59bNXUTxtk7b3ZcKDP+LA9cVx9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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