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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dbf79299b90606a51c73ea2a13fc11247f540a6f4e6cc4117ce1b41f1420182d' 
  AND token = 'jzVZ/b5Cd7rAxPZM9RJYoKOeNu4dq5KoHau5oUJ97LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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