SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0b7d4469d001171b30063f6db19f1608068062188a1da1147dfe978e0930541c' 
  AND token = 'JBWvw5rCblCxu0XiVVU7+oXZhunzB9WYQZERM+5SNxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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