SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '67143a07d121adce54ff93ed2864c8c3202f7ed119b51fa9d2a2c843fabd0c1a' 
  AND token = 'B1J+vhqfM0M19ZMqVF3sXjnZ7EHh0XrSAsczZNfpUyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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