SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd6d59ddbafeefa8bfeaa1bdbe923ca4fb4f8e37af701ed48b6e4b2999589d0a1' 
  AND token = 'q1zwrLfunn+/3/PgB/BazG3zm1ln4ZWcYrjWYL9NRWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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