SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c609cc48d4b6bfb1d696ab0d21c0a24fb8e3932f15f728b5875465b419f5fadb' 
  AND token = 'Tq8XsG2uqZ4duG4cX5Gl/Aj8PIWxcBbuJhHXvMkapgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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