SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '95a92de9fa9ca5e0bfa0705ae9c32d7803898a5f4f50df3b875b27c0924225ad' 
  AND token = 'NKhqf+FM/QJbvXsKRdUF6tQPp+PreO9RBj2G+Cpq64I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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