SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ffe774b3bd74b8a8a4c437b106a0f3f59851efd18779acb66c2b056ab7b8acb6' 
  AND token = 'Q1nHCXtK/JlVP8eskLvlFfA0VTuPZ3j+jXABwM60TzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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