SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f7d2edcdb2140e86ba8ef55a3d41391281848a35c034d6fca5929851d1598506' 
  AND token = '23LaTzgZPpJ6On0NJOab7oxvgzvYUkUSzscD8GSB34Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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