SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9db6724c30cc627c48596b03e3a5d3f58ced408e4af1a45f36111d5f22d8f289' 
  AND token = 'qA0rVJQi7f+mpGLBZXdSPe0lKD4cIdk36U/DU0fwxno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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