SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '05f9196b3be012d1990873d00dab31235b2f502f697060872bfafa29a32449f3' 
  AND token = 'sIzMbG4W9P1aBVKtTKBIYVyFLvveNHChUmU/9G5G+1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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