Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42a779690083de0baeda045c879f2d9499942f075a1e5b1f932f5f44d6ebafe' 
  AND token = 'v4N8IhExomtoJGbAzgCVejh9Ng28Ru7HmakHVrIl9yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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