Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '454f38dd0d8fcc52942bb2cfb0e65c3150e6c61c2352b9a7d4fb5d6bf2c9d257' 
  AND token = 'nJQUMmPrb/IMFoA2UEBJKs4fUnCM4eHU/aMJSXbRYbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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