Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '42758e1cfe7e7dd1b0e149f7797da1c026f859762411e664c5c3b1e2767e32e0' 
  AND token = '4HNwnOxo9ZlPY/bu4qA+lVat7PQNWOmStUu/a78dkTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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