SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2b973b34bb8366dcb0c726a0fd3a9a697b0f3ee478da2d07503d3f559e11d410' 
  AND token = 'UY4nIawkjOefhlZkYA9/mfVenQLBMAw9uyPwZf6U6lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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