SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5975b3a4a89d7bbf6a95fac241df6dbcc1586e93a17d60e5df34a13c25c842ff' 
  AND token = 'VUZZfXeAsEupQgousv4q/NqzNQmDPH+oKcIaSRzDP0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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