SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7de2a22f2005fbee1046c213a5052175b1d80c544c8a4bbaf8a3248dab83233b' 
  AND token = 'xYYA4Wj+ll5idPE3sNFiurUWUZzaQGZLJGbChOKRdBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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