Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db73d987e901df30acd0a6bf1ed058293d7169c86112bc2574ec989eb0e0bc56' 
  AND token = '6PfQy+Yy5B2J5Rgfm8XPBMJ9tCgjJLuVPuF9s/42ndI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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