SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '929514e4acf5d8b8a30bfa1ed5b1fc62f478bcc9be05a1778c4a15447707cd64' 
  AND token = 'qZQqdZpLhusG6I9yPujMqZjgkV/5zEVz86tSo+PyuKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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