SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0236b6585055c4b7dbb1ee17deda281a62afe528bfbf3b43f29d11343aedf2fd' 
  AND token = 'gvGCMCJ3X+YEzDVIo7R6oAI5WwkpTNPw3IZo9vWvApg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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